📄 i16.asm
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; AL 07h ;
; DS 0040h ;
; output: ;
; CY Error ;
; NC Success ;
; AL = 0FAH ;
; register destroyed : AL ;
;-----------------------------------------------------------------------;
extrn flash_write_enable:near
ah_e0_7 proc near
call flash_write_enable
jmp short ah_e0_exit
ah_e0_7 endp
;-----------------------------------------------------------------------;
; AH_E0_8..FLASH SELECT ;
; input : ;
; AH function# E0h ;
; AL 08h ;
; DS 0040h ;
; output: ;
; CY Error ;
; NC Success ;
; AL = 0FAH ;
; register destroyed : AL ;
;-----------------------------------------------------------------------;
ah_e0_8 proc near
jmp short ah_e0_exit
ah_e0_8 endp
;-----------------------------------------------------------------------;
; AH_E0_9..FLASH DE-SELECT ;
; input : ;
; AH function# E0h ;
; AL 09h ;
; DS 0040h ;
; output: ;
; CY Error ;
; NC Success ;
; AL = 0FAH ;
; register destroyed : AL ;
;-----------------------------------------------------------------------;
ah_e0_9 proc near
jmp short ah_e0_exit
ah_e0_9 endp
;-----------------------------------------------------------------------;
; AH_E0_A..VERIFY ALLOCATED MEMORY ;
; input : ;
; AH function# E0h ;
; AL 0Ah ;
; ES specified memory segment ;
; BX memory size in number of paragraphs ;
; DS 0040h ;
; output: ;
; CY Error ;
; NC Success ;
; AL = 0FAH ;
; register destroyed : AL ;
;-----------------------------------------------------------------------;
ah_e0_a proc near
jmp short ah_e0_exit
ah_e0_a endp
;-----------------------------------------------------------------------;
; AH_E0_B..SAVE INTERNAL CACHE STATUS ;
; input : ;
; AH function# E0h ;
; AL 0Bh ;
; ES:DI pointer to start of buffer where internal cache ;
; status will be saved ;
; DS 0040h ;
; output: ;
; CY Error ;
; NC Success ;
; AL = 0FAH ;
; register destroyed : AL ;
;-----------------------------------------------------------------------;
ah_e0_b proc near
jmp short ah_e0_exit
ah_e0_b endp
;-----------------------------------------------------------------------;
; AH_E0_C..RESTORE INTERNAL CACHE STATUS ;
; input : ;
; AH function# E0h ;
; AL 0Ch ;
; ES:DI pointer to start of buffer where internal cache ;
; status will be restored ;
; DS 0040h ;
; output: ;
; CY Error ;
; NC Success ;
; AL = 0FAH ;
; register destroyed : AL ;
;-----------------------------------------------------------------------;
ah_e0_c proc near
jmp short ah_e0_exit
ah_e0_c endp
;-----------------------------------------------------------------------;
; AH_E0_FF..GENERATE CPU RESET ;
; input : ;
; AH function# E0h ;
; AL FFh ;
; DS 0040h ;
; output: ;
; NONE ;
; register destroyed : AX ;
;-----------------------------------------------------------------------;
extern StopUsbHostController(dummy_ret):near
extrn dummy_ret:near
extrn generate_hard_reset:near
ah_e0_ff proc near
mov ax,0c08eh
call cmos_data_out_x ; destroy CMOS checksum
call generate_hard_reset
; call StopUsbHostController ; disable USB host controller
; call empty_8042_input_buffer
; mov si,cs:word ptr [0fea8h]
; mov dx,cs:[si+0ch] ; DX = power-on CPU ID
; db 0eah ; JMP FAR F000:FFF0
; dw 0fff0h
; dw 0f000h
ah_e0_ff endp
;-----------------------------------------------------------------------;
; AH_E0_10..GET FLASH INFO ;
; input : ;
; AH function# E0h ;
; AL 10h ;
; output: ;
; CY Error ;
; NC Success ;
; AL = 0FAH ;
; BX = Version# in BCD ;
; CX = #of Flash parts supported by BIOS (1-based) ;
; DX = Index# of the Flash Part detected by BIOS (0-based);
; register destroyed : AL BX CX DX ;
;-----------------------------------------------------------------------;
extrn flash_support_table:byte
extrn no_of_flash_supported:abs
ah_e0_10 proc near
mov bx,0350h ; Ver# 3.50
mov cx,no_of_flash_supported
mov dx,cgroup:word ptr flash_support_table
cmp dx,0ffffh
jz ahe010_00 ; BIOS did not install any flash part
xor dx,dx
ahe010_00:
jmp ah_e0_exit
ah_e0_10 endp
;-----------------------------------------------------------------------;
; AH_E0_11..READ ROM BYTES ;
; input : ;
; AH function# E0h ;
; AL 11h ;
; CX = #of bytes to be read ;
; ES:DI = ptr to read buffer ;
; DS:SI = ptr to start ROM address ;
; output: ;
; CY Error ;
; NC Success ;
; AL = 0FAH ;
; CX = #of bytes read ;
; register destroyed : AL CX ;
;-----------------------------------------------------------------------;
extrn e000_read_rom_write_x:near
extrn f000_read_rom_write_x:near
extrn e000_read_ram_write_rom:near
extrn f000_read_ram_write_rom:near
ah_e0_11 proc near
pusha
call e000_read_rom_write_x
call f000_read_rom_write_x
dec cx
rep movsb
movsb
call e000_read_ram_write_rom
call f000_read_ram_write_rom
popa
jmp ah_e0_exit
ah_e0_11 endp
COMMENT ~
;-----------------------------------------------------------------------;
; CYRIX Cx6x86 M1 Subroutines ;
;-----------------------------------------------------------------------;
; OFF_CYRIX ;
; this routine disbales WT_ALLOC bit (bit-0) in CCR5 in M1 cpu. ;
; input : ;
; none ;
; output: ;
; none ;
; register destroyed : none ;
;-----------------------------------------------------------------------;
extern ReadCCR(dummy_ret):near
extern WriteCCR(dummy_ret):near
off_cyrix:
pusha
call check_cyrix
jnz oc_00 ; Cx6x86 not found
call unlock_ccr
mov al,0e9h
call ReadCCR
and ah,0feh ; bit-0 WT_ALLOC = 0
call WriteCCR
call lock_ccr
oc_00:
popa
ret
;-----------------------------------------------------------------------;
; CHECK_CYRIX_M1 ;
; this routine checks whether current CPU is Cyrix M1. ;
; input : ;
; none ;
; output: ;
; zr Cyrix M1 ;
; nz not Cyrix M1 ;
; register destroyed : none ;
;-----------------------------------------------------------------------;
extrn get_processor_info:near
check_cyrix:
pushad
call get_processor_info ; AX = function field
and ah,01100000b
cmp ah,00100000b ; ZR/NZ = Cx6x86 found/not found
popad
ret
;-----------------------------------------------------------------------;
; UNLOCK_CCR ;
; this routines locks/unlocks access to CCR registers in Cyrix M1. ;
; input : ;
; none ;
; output: ;
; zr Cyrix M1 ;
; nz not Cyrix M1 ;
; register destroyed : AX BX ;
;-----------------------------------------------------------------------;
unlock_ccr:
mov bl,10h
uc_00:
mov al,0c3h
call ReadCCR
or ah,bl
and ah,0feh
call WriteCCR
ret
lock_ccr:
mov bl,00h
jmp short uc_00
~
;-----------------------------------------------------------------------;
;*****************************************************************;
;*****************************************************************;
;** **;
;** (C)Copyright 1985-1996, American Megatrends Inc. **;
;** **;
;** All Rights Reserved. **;
;** **;
;** 6145-F, Northbelt Parkway, Norcross, **;
;** **;
;** Georgia - 30071, USA. Phone-(770)-246-8600. **;
;** **;
;*****************************************************************;
;*****************************************************************;
;-----------------------------------------------------------------------;
IF MKF_EXTRA_INT16_F0 ; INT16 Func F0-F4 supported
extrn frequency_low:near
extrn frequency_high:near
extrn cache_off:near
extrn cache_on:near
special_int_16_table label word
dw offset cgroup:ah_f0 ; set cpu speed
dw offset cgroup:ah_f1 ; return cpu speed
dw offset cgroup:ah_invalid; invalid function
dw offset cgroup:ah_invalid; invalid function
dw offset cgroup:ah_f4 ; external cache
special_int_16_table_end label word
;-----------------------------------------------------------------------;
; AH_F0..SET CPU SPEED ;
; input : ;
; AH function# F0h ;
; AL speed ;
; 00 low speed ;
; 01 low speed ;
; 02 high speed ;
; 03-FF..RESERVED (no action will taken if used) ;
; DS 0040h ;
; output: ;
; none ;
; register usage..all registers must be saved except SI ;
;-----------------------------------------------------------------------;
ah_f0 proc near
cmp al,02h ; high speed ?
ja ahf0_00 ; invalid speed..no action
mov si,offset cgroup:frequency_high
jz ahf0_01 ; high speed
mov si,offset cgroup:frequency_low
ahf0_01:
push cx
call si ; change speed
pop cx
mov ah,0f0h ; set ah not changed
ahf0_00:
ah_invalid::
ret
ah_f0 endp
;-----------------------------------------------------------------------;
; AH_F1..RETURN CPU SPEED ;
; input : ;
; AH function# F1h ;
; DS 0040h ;
; output: ;
; AL speed ;
; 00 low speed ;
; 01 low speed ;
; 02 high speed ;
; register usage..all registers must be saved except SI ;
;-----------------------------------------------------------------------;
ah_f1 proc near
mov al,00h ; return code for low speed
test ds:byte ptr [0016h],00100000b; bit-5 = 0/1..high/low speed
jnz ahf1_00 ; low speed
mov al,02h ; return code for high speed
ahf1_00:
ret
ah_f1 endp
;-----------------------------------------------------------------------;
; AH_F4..CACHE ;
; input : ;
; AH function# F1h ;
; AL subfunction# ;
; DS 0040h ;
; output: ;
; register usage..all registers (except return registers) must be ;
; saved except SI ;
;-----------------------------------------------------------------------;
ah_f4 proc near
or al,al ; subfunc# 00h ?
jz ahf4_00 ; yes..
mov si,offset cgroup:cache_off
cmp al,02h ; subfunc# 02h ?
ja ahf4_03 ; invalid subfunction
jz ahf4_02 ; subfunc# 02h
mov si,offset cgroup:cache_on
ahf4_02:
push cx
call si ; enable/disable external cache
or ch,ch ; cache operation done ?
pop cx
jmp short ahf4_03
ahf4_00:
;-----------------------------------------------------------------------;
; subfunction# 00h..return cache controller status ;
; Input : AH = function# F4h ;
; AL = 00h ;
; Output : ;
; AL = cache controller status ;
; CX = cache size in KBytes ;
; DH = cache write technology ;
; DL = cache type ;
; Register Destroyed: AX CX DX if successful ;
; NONE if status can not be determined ;
;-----------------------------------------------------------------------;
mov al,33h ; cmos reg 33h..enable NMI
call cmos_data_in_x
test al,00000001b ; bit-0 = 0/1..cache bad/good
jnz ahf4_06 ; external cache present
; external cache not present..check for internal cache..
smsw ax
or ah,ah
mov al,00h ; return code for cache not present
jnz ahf4_05 ; 386/286 cpu..no internal cache
ahf4_06:
mov al,01h ; return code for cache enabled
test ds:byte ptr [0016h],00010000b; bit-4 = 0/1..cache dis/en abled
jnz ahf4_05 ; cache enabled
mov al,02h ; return code for cache disabled
ahf4_05:
call get_cache_informn ; get cache information
ahf4_03:
mov ah,0f4h ; ah remain same as this routine is called
ret
ah_f4 endp
;-----------------------------------------------------------------------;
; GET_CACHE_INFORMN ;
; this routine returns the external cache information. ;
; input : ;
; DS 0040h ;
; stack available ;
; output: ;
; cx cache size ;
; bit 15 = 0/1..cache size information valid/invalid ;
; bit 14-0= cache size in KBytes ;
; dh cache write technology ;
; bit 7 = 0/1..cache write technology informn valid/invalid
; bit 6-1 = RESERVED (set to 0) ;
; bit 0 = 0..write-through cache ;
; 1..write-back cache ;
; dl cache type ;
; bit 7 = 0/1..cache type information valid/invalid ;
; bit 6-1 = RESERVED (set to 0) ;
; bit 0 = 0..direct mapped cache ;
; 1..2-way set associative cache ;
; register usage -- DO NOT DESTROY ANY REGISTER except CX DX ;
;-----------------------------------------------------------------------;
get_cache_informn proc near
; this routine has to return information of cache size in CX, of cache write
; technology in DH, of cache type in DL..
; DO NOT DESTROY ANY REGISTER EXCEPT CX, DX
; let us take some examples:
; example 1. NONE OF THE INFORMATION IS AVAILABLE
; in this case return value of CX = 8000h, DX = 8080h
; example 2. 64KB CACHE, CACHE WRITE AND CACHE TYPE INFORMATION IS
; NOT AVAILABLE
; in this case return value of CX = 0040h, DX = 8080h
; example 3. WRITE-BACK CACHE, CACHE SIZE AND CACHE TYPE INFORMATION IS
; NOT AVAILABLE
; in this case return value of CX = 8000h, DX = 0180h
; example 4. 2-WAY SET ASSOCIATIVE CACHE, CACHE SIZE AND CACHE WRITE
; INFORMATION IS NOT AVAILABLE
; in this case return value of CX = 8000h, DX = 8001h
; example 5. 512KB, WRITE-THROUGH, DIRECT-MAPPED CACHE
; in this case return value of CX = 0200h, DX = 0000h
mov cx,8000h ; cache size informn invalid
mov dx,8080h ; cache write, cache type informn invalid
ret
get_cache_informn endp
;-----------------------------------------------------------------------;
ENDIF
;-----------------------------------------------------------------------;
public _I16_ENDS
_I16_ENDS label byte ; marks end of module
;---------------------------------------;
_text ends
end
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